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OBJECT TAPE FORMAT
The IMSAI Self-Contained System is supplied on paper
tape In a blocked hexadecimal format.
tape is blocked into discrete records, each record con
taining record length, record type, memory address and
checksum information in addition to data.
frame description is as follows:
Frame 0
Frames 1,2
(0-9,A-F)
Frames 3 to 6
Frames 7, 8
Frames 9 to 9+2*
(Record Length) -1
Record Mark.
Signals the start of
a record.
The ASCII character colon
(":" HEX 3A) is used as the record
m ar k .
Record Length.
Two ASCII characters
representing a hexadecimal number in
the range 0 to 'FF'
is the count of actual data bytes in
the record type or checksum.
record length of 0 indicates end of
file.
Load Address.
Four ASCII characters'
that represent the initial memory lo
cation where the data following will
be loaded.
The first data byte is
stored in the location pointed to by
the load address; succeeding data
bytes are loaded into ascending
addresses.
Record Type.
Two ASCII characters.
Currently all records are type 0.
This field is reserved for future
expansion.
Data.
Each 8 bit memory word is
represented by two frames containing
the ASCII characters
to represent a hexadecimal value 0 to
'FF'H (0 to 255).
IMSAI 8080
Self-Contained System
Object Tape Format
Revision 2
The data on the
A frame-by-
(0 to 255).
This
A
(0 to 9, A to F)
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